### Abstract

We have numerically investigated the effects of correlation and clustering on the far-infrared (FIR) absorption and surface-plasmon modes of a model two-dimensional metal-insulator composite. We model the composite as a diluted resistor-inductor-capacitor (RLC) network. Two-site and nearest-neighbor-site correlations among the conducting bonds are found to enhance the FIR absorption per metallic bond by a factor of 5 relative to a network of the same concentration with a purely random distribution of metallic bonds. Ring-shaped clusters (which model insulating particles with a metallic coating), and percolation clusters are found to produce a FIR absorption enhanced by more than 2 orders of magnitude per metallic bond. The surface-plasmon absorption peak in a percolation cluster is found to be strongly broadened relative to the predictions of the Maxwell Garnett approximation. In the two-site correlation model, the surface-plasmon absorption peak is weakly split, whereas in the nearest-neighbor site-correlation model, it is weakly red shifted. Ring-shaped clusters are found to produce double and triple peaks in the surface-plasmon frequency range. Possible explanations for these novel features are briefly discussed.

Original language | English (US) |
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Pages (from-to) | 13224-13230 |

Number of pages | 7 |

Journal | Physical Review B |

Volume | 39 |

Issue number | 18 |

DOIs | |

State | Published - 1989 |

### ASJC Scopus subject areas

- Condensed Matter Physics

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## Cite this

*Physical Review B*,

*39*(18), 13224-13230. https://doi.org/10.1103/PhysRevB.39.13224